Creation: Appeared between 1965-67, when US 17 was given its western Murrells Inlet Bypass. This was mainline US 17 prior and ran only through the town of Murrells Inlet. This is the 1st of 2 US 17 Bus routes.
Adjustments: In 1981, US 17 Business was extended north through the Surfside Beach and Myrtle Beach area, replacing more mainline US 17.
Improvements: Fully paved from inception; The extended Myrtle Beach portion of the route was already multilaned when designated US 17 Business.
Comment: US 17 Business for Myrtle Beach uses Kings Hwy.
US 17 Business was the original SC 49.
In Murrells Inlet the route is still fairly undeveloped, while Myrtle Beach is the polar opposite.
US 17 Business is the longest business route in South Carolina.

US 17 Bus #2: Appeared about 1967 as a renumbering of mainline US 17 through Mt. Pleasant
In 1992, US 17 Business was redesignated as SC 703 on its western half and I-526 Bus on its eastern half.
US 17 Business used Coleman Blvd and Georgetown Rd through Mt Pleasant.